I was going through my hives checking for shb and looking to see how much they have stored up for winter. One of my hive stands is the fabricated style from Dadant. It has a removable tray that I try to keep vegetable oil in but the floor of the bottom is sloped downward toward the \screen above the tray. That gives the bees a lot of extra room to practice their comb building skills. Or at least that's what they did this year. Didn't find this last fall when I checked all the way through just prior to cold weather. I thought it was interesting. I couldn't see any closed or capped cells and everything looked empty. Any reason not to scrape it off? I guess one reason to leave it is they'll probably just build it back wasting more energy etc.